Fix: transform file extension for .ts and .tsx assets inside block.json files

[fabiankaegy]

Related Issue/RFC: #414

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[Antonio-Laguna]

This LGTM. I don't see this takes care of the actual compilation process? It'd be good to have one block example on the project to demonstrate the full flow otherwise!

[fabiankaegy]

@Antonio-Laguna any .ts / .tsx file that gets added as an entrypoint to webpack gets transpiled to just JS. So without this we had the issue that the file path we provide now is no longer correct in the dist block.json since it still references the TS file.

So this fix here really is only to make sure we also rename the entry after assets are already transpiled :)

[Antonio-Laguna]

@fabiankaegy been a while since I've gone through this!! Thanks!